CN103586294A - Laminar cooling method, hot continuous rolling production line and production line laminar cooling system for thick plates - Google Patents
Laminar cooling method, hot continuous rolling production line and production line laminar cooling system for thick plates Download PDFInfo
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Abstract
本发明涉及一种厚板的层流冷却方法、一种热连轧生产线及其层流冷却系统，所述层流冷却方法使用热连轧生产线的层流冷却系统对所述厚板进行层流冷却，所述厚板沿所述热连轧生产线的轧制方向通过所述层流冷却系统，并且，所述层流冷却系统对所述厚板的冷却依次包括第一次冷却、第二次冷却以及第三次冷却，所述第一次冷却和所述第三次冷却的冷却速度大于所述第二次冷却的冷却速度。本发明的厚板的层流冷却方法通过对厚板施行三段式冷却，使得钢板性能沿厚度方向的不均匀性减小，提高厚板物理性能。
The invention relates to a laminar flow cooling method for a thick plate, a hot continuous rolling production line and its laminar cooling system. The laminar cooling method uses the laminar cooling system of the hot continuous rolling production line to perform laminar flow on the thick plate cooling, the thick plate passes through the laminar flow cooling system along the rolling direction of the hot continuous rolling production line, and the cooling of the thick plate by the laminar flow cooling system includes the first cooling, the second cooling cooling and the third cooling, the cooling rates of the first cooling and the third cooling are greater than the cooling rate of the second cooling. The laminar flow cooling method of the thick plate of the present invention implements three-stage cooling on the thick plate, so that the inhomogeneity of the performance of the steel plate along the thickness direction is reduced, and the physical properties of the thick plate are improved.
Description
Technical field
The present invention relates to steel rolling field, particularly, relate to laminar cooling system and a kind of hot continuous rolling production line of a kind of laminar flow cooling means of slab, a kind of hot continuous rolling production line.
Background technology
In the production process of hot-continuous-rolling strip steel, need to from finishing mill, roll out with steel, to carry out laminar flow cooling so that coiling temperature is controlled in applicable scope, thereby guarantee the performance with steel produced.The cooling basic principle of laminar flow is to open quantity and cooling water flow etc. by the collector of key-course flow cooling system, guarantees to enter the coiling temperature after coiling machine with steel, thereby improves metallographic structure and performance with steel.It is higher that steel plate rolls out rear temperature from finishing mill, variations in temperature in laminar cooling system is larger, in structure property of cooling procedure light plate etc., also can there is larger variation, the quality with steel that directly impact is produced, therefore, the form that arranges of laminar cooling system and control method can affect the quality with steel.
For example, employing has the laminar cooling system of high-density tube cooling facility for laminar flow as the laminar cooling system of the hot continuous rolling production line of production Wide and Thick Slab, first, in this laminar cooling system, steel plate need to drop to 500 ℃ of left and right from 900 ℃ of left and right, variations in temperature is larger, heat flow modulus and thermophysical parameter also will be varied with temperature and being changed at this process light plate, secondly, cooling water flow impacts surface of steel plate, length direction along steel plate, in nearly impact zone certain limit, it is the laminar region of cooling water, be the turbulent region of cooling water at a distance, it between laminar region and turbulent region, is transition region, whole cooling procedure has experienced different cooling stages, steel plate diabatic process is astable.With regard to Wide and Thick Slab itself, its length and width size is far longer than the size of thickness direction, and the heat dissipation capacity of thickness direction is greater than other both direction, steel plate is in cooling procedure, large many in temperature suppression ratio centre on surface, between 300 ℃ ~ 700 ℃, the coefficient of heat transfer between steel plate and cooling water is exponential form increase with the decline of steel billet temperature, cause cooling procedure light plate surface cool speed to improve constantly, also make steel plate thickness direction thermograde strengthen, and steel plate is thicker, cooling velocity is larger, the temperature difference in surface of steel plate and centre is also larger, the actual cooling velocity on top layer is than large many of the cooling velocity in centre, and the poor conference excessively of the cooling velocity in surface of steel plate and centre causes the microscopic structure of steel plate uneven along steel plate thickness direction, make plate property through-thickness uneven.Production for Wide and Thick Slab, it is cooling that the quick cooling mode of use is at present carried out laminar flow, be mandatory cooling in the short time, make the inhomogeneities of plate property through-thickness become large, even can cause surface of steel plate to produce non-normal tissue, affect plate property, and the cooling length of laminar cooling system be shorter, steel plate is thicker, and this shortcoming is just more outstanding.
Therefore, the form that arranges of laminar cooling system and the adjustment precision of intensity of cooling etc. are all extremely important to the stable control of the assurance of plate property and coiling temperature.
Summary of the invention
The laminar flow cooling means that the object of this invention is to provide a kind of slab, the method is cooling by slab is implemented to syllogic, and the inhomogeneities of plate property through-thickness is reduced, and improves slab physical property.
Another object of the present invention is to provide a kind of laminar cooling system of hot continuous rolling production line, this system is provided with temperature measuring apparatus, and the cooling device segmentation of this system is installed and can be regulated and controled respectively by control module, thereby improved the adjustment precision of intensity of cooling, be conducive to guarantee the performance of steel plate.
In addition, the present invention also provides a kind of laminar cooling system.
To achieve these goals, the invention provides a kind of laminar flow cooling means of slab, it is cooling that the laminar cooling system that the method is used hot continuous rolling production line carries out laminar flow to described slab, described slab passes through described laminar cooling system along the rolling direction of described hot continuous rolling production line, and, described laminar cooling system comprises cooling, cooling and cooling for the third time for the second time for the first time successively to described slab cooling, cooling cooling velocity for the second time described in described cooling and described cooling cooling velocity for the third time is for the first time greater than.
Preferably, the described cooling and described water-cooled that is cooled to for the third time for the first time, the described air cooling that is cooled to for the second time.
Preferably, during described cooling beginning for the second time, the surface temperature of described slab is 710 ℃ ~ 730 ℃; During described cooling end for the second time, the surface temperature of described slab is 660 ℃ ~ 700 ℃.
Preferably, the method is included in described in described slab is carried out and in cooling process, the surface temperature of described slab is measured for the second time, then comparative measurements value and target temperature value, when described measured value equals described target temperature value, maintain the current state of cooling; When described measured value is greater than described target temperature value, cooling cooling velocity fast for the first time described in increase; When described measured value is less than described target temperature value, quick cooling cooling velocity for the first time described in reducing.
Preferably, in the described cooling position that proceeds to 1/3 to 2/3 place for the second time, the surface temperature of described slab is measured, described target temperature value is 700 ℃ ~ 720 ℃.
Preferably, the thickness of described slab is 18mm ~ 45mm.
The present invention also provides a kind of laminar cooling system of hot continuous rolling production line, and this laminar cooling system comprises the first rapid chilling section, air cooling section and the second rapid chilling section setting gradually along the rolling direction of this hot continuous rolling production line.
Preferably, described the first rapid chilling section and described the second rapid chilling section comprise respectively a plurality of cooling group that along described hot continuous rolling production line, arranges, described cooling group of control valve that comprises collector and regulate cooling water flow in this collector, in described air cooling section, be provided with temperature measuring apparatus, this hot continuous rolling laminar cooling system also comprises the control module of controlling described control valve, described temperature measuring apparatus is electrically connected to described control module, measured value is transferred to described control module.
Preferably, cooling group includes many collectors described in each, and is provided with described control valve on every described collector.
Preferably, in described control module, be set with target temperature value, when the measured value of described temperature measuring apparatus equals described target temperature value, the control valve that described control module is controlled described the first rapid chilling section maintains current state; When the measured value of described temperature measuring apparatus is greater than described target temperature value, described control module regulates the control valve in described the first rapid chilling section, to open more described control valve and/or increase the cooling water flow of described collector in described the first rapid chilling section; When the measured value of described temperature measuring apparatus is less than described target temperature value, described control module regulates the control valve in described the first rapid chilling section, to open described control valve still less and/or reduce the cooling water flow of described collector in described the first rapid chilling section.
Preferably, described temperature measuring apparatus is positioned at described air cooling section along 1/3 to 2/3 region of its length, and described target temperature value is 700 ℃ ~ 720 ℃.
Preferably, this laminar cooling system comprises that this velocity sensor is electrically connected to described control module for measuring the velocity sensor of the roller table speed of hot continuous rolling production line, so that the roller table speed recording is transferred to described control module.
The present invention also provides a kind of hot continuous rolling production line, this hot continuous rolling production line comprises described laminar cooling system, many finishing mills and coiling machine, and described laminar cooling system is arranged on along between last finishing mill and described coiling machine of the rolling direction of this hot continuous rolling production line.
According to the laminar flow cooling means of slab of the present invention, be cooling to slab execution syllogic, thereby the less surface temperature of steel plate and the difference of internal temperature of making of cooling cooling velocity reduces for the second time, and can be air cooling by cooling settings for the second time, steel plate is suspended to laminar flow cooling and make steel plate naturally cooling, make the temperature of slab can more be tending towards homogenising in air cooling section, thereby make the microstructure through-thickness homogenising of slab, prevent that slab surface from producing non-normal tissue, improves the performance of slab.
According to the laminar cooling system of hot continuous rolling production line of the present invention, comprise three cooling sections, the first rapid chilling section and the second rapid chilling section all comprise a plurality of cooling group, and in the collector of cooling group, control valve is installed, thereby has increased the adjusting range of the intensity of cooling of this system; And, temperature control equipment is also installed in air cooling section, thereby can adjusts the intensity of cooling of this system by measured value and the control module of temperature, so that slab is in the good state of cooling; By the control in the intensity of cooling of the different sections of whole system to steel plate, be conducive to optimize the metallurgical structure of steel plate, improve the physical property of steel plate.
Other features and advantages of the present invention partly in detail are described the specific embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with the specific embodiment one below.In the accompanying drawings:
Fig. 1 is the partial structurtes schematic diagram according to hot continuous rolling production line of the present invention.
Description of reference numerals
1 first rapid chilling section 2 air cooling sections
3 second cooling group of rapid chilling sections 4
5 temperature measuring apparatus 6 finishing mills
7 coiling machine 8 band steel
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, the specific embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
It is cooling that the laminar cooling system that the laminar flow cooling means of slab of the present invention is used hot continuous rolling production line carries out laminar flow to slab, slab passes through laminar cooling system along the rolling direction of hot continuous rolling production line, and, laminar cooling system comprises cooling, cooling and cooling for the third time for the second time for the first time successively to slab cooling, for the first time cooling and for the third time cooling cooling velocity be greater than cooling for the second time cooling velocity.
According to the laminar flow cooling means of slab of the present invention, be cooling to slab execution syllogic, laminar flow is cooling while just having started, the temperature of slab is higher, cooling velocity is very fast, the surface of slab and the temperature difference in centre can increase very soon, dimension, after cooling for the first time, set up cooling for the second time, cooling cooling velocity is less for the second time, thereby slab difference of surface temperature and internal temperature in cooling for the second time process is reduced gradually, make the temperature of slab more be tending towards homogenising, thereby make the microstructure through-thickness homogenising of slab, prevent that slab surface from producing non-normal tissue, improve the performance of slab.
Preferably, cooling and be cooled to for the third time water-cooled for the first time, be cooled to for the second time air cooling, for the first time cooling and for the third time cooling middle employing cooling water that slab is carried out to laminar flow is cooling, in cooling procedure, only make slab naturally cooling for the second time, in this case, there is the larger temperature difference in the strong cooling surface of slab and the center of making that is subject to cooling water due to slab in cooling procedure for the first time, slab is naturally cooling in cooling for the second time process, more be conducive to the heat at center of slab gradually to the diffusion into the surface of slab, therefore the temperature that is more conducive to slab is tending towards homogenising.
Under preferable case, during cooling beginning for the second time, the surface temperature of slab is 710 ℃ ~ 730 ℃; During cooling end for the second time, the surface temperature of slab is 660 ℃ ~ 700 ℃, and while starting by controlling air cooling, the surface temperature of slab is controlled position and the time of air cooling when finishing, and makes grain refinement, metallographic structure transformation and the structural homogeneity of steel plate better.
In addition, as a kind of preferred embodiment, can also in being carried out to cooling for the second time process, slab measure the surface temperature of slab, then comparative measurements value and target temperature value, and by comparative result, the state of cooling is adjusted.Particularly, when measured value equals target temperature value, maintain the current state of cooling; When measured value is greater than target temperature value, increase for the first time cooling cooling velocity fast; When measured value is less than target temperature value, reduce for the first time cooling cooling velocity fast.By can effectively guaranteeing that to the adjustment of cooling velocity the slab of producing is in good intensity of cooling, thereby optimize institutional framework and the performance of slab.Because cooling for the second time cooling velocity is less than cooling and cooling cooling velocity for the third time for the first time, the temperature changing speed of slab is also less, therefore, surface temperature to slab in cooling for the second time process detects, so more be conducive to cooling for the first time cooling effect to detect, and to for the first time cooling and for the second time cooling cooling velocity correspondingly adjust.
In addition, target temperature value be by the thickness of slab and for the first time the position etc. of temperature, roller table speed and measuring point for the temperature during cooling finish determine, for common slab, in cooling arbitrary position in proceeding to 1/3 to 2/3 for the second time, the surface temperature of slab is measured, target temperature value is preferably 700 ℃ ~ 720 ℃.
Preferably, the thickness of slab is 18mm ~ 45mm, and the production that laminar flow cooling means of the present invention is applied to the slab of this thickness can reach comparatively ideal effect.
The present invention also provides a kind of laminar cooling system of hot continuous rolling production line, and this laminar cooling system comprises the first rapid chilling section 1, air cooling section 2 and the second rapid chilling section 3 setting gradually along the rolling direction of this hot continuous rolling production line.Participate in Fig. 1, air cooling section 2 is the parts of ordering to A2 from A1 point.
The laminar cooling system of this hot continuous rolling production line comprises three cooling sections, slab is implemented to syllogic cooling, the first rapid chilling section 1 and the second rapid chilling section 3 adopt cooling water to carry out cooling to slab, second cooling section is air cooling section 2, thereby make to force cooling fast slab naturally cooling in air cooling section 2 in the first rapid chilling section 1, the surface of slab and the temperature difference at center reduce gradually, the temperature of slab is more tending towards homogenising, thereby the microstructure through-thickness that makes slab is homogenising more, prevent that slab surface from producing non-normal tissue, be conducive to optimize the metallurgical structure of steel plate, improve the physical property of steel plate.
Preferably, the first rapid chilling section 1 and the second rapid chilling section 3 comprise respectively a plurality of cooling group 4 that along hot continuous rolling production line, arranges, the control valve that comprises collector for cooling group 4 and regulate cooling water flow in this collector, the temperature measuring apparatus 5 being provided with in air cooling section 2 in temperature measuring apparatus 5(Fig. 1 is arranged on A point place), this hot continuous rolling laminar cooling system also comprises the control module that controls to adjust valve, temperature measuring apparatus 5 is electrically connected to control module, so that measured value is transferred to control module.By all arrange a plurality of cooling group 4 in the first rapid chilling section 1 and the second rapid chilling section 3, and on the collector of cooling group 4, control valve is installed, the cooling water flow in the first rapid chilling section 1 and the second rapid chilling section 3 is regulated to the variation of cooling velocity (thereby cause); And, temperature control equipment is also installed in air cooling section 2, thereby measured value and control module by temperature can be adjusted the intensity of cooling of whole laminar cooling system, so that slab is in the good state of cooling, be conducive to optimize the institutional framework of steel plate, improve the physical property of steel plate.
Wherein, in air cooling section 2, also can be provided with closable cooling group 4, generally, a hot continuous rolling production line is often used for the production of Multiple Type steel, when producing slab, A1 point is closed and formed air cooling section 4 to cooling group 4 between A2 point, when producing other steel, can again A1 point be opened to cooling group 4 between A2 point.And the length that A1 point is ordered to A2 (being the length of air cooling section 2) can be passed through the difference of the closed quantity of cooling group 4 and difference.
As a kind of preferred embodiment, each cooling group 4 includes many collectors, and is provided with control valve on every collector, in this case, every collector is single valve single control, thereby has increased the adjustment precision of cooling velocity, is more conducive to control cooling velocity.
Preferably, in control module, be set with target temperature value, and by comparison object temperature value and measured value, the state of cooling adjusted.When the measured value of temperature measuring apparatus 5 equals target temperature value, the control valve that control module is controlled the first rapid chilling section 1 maintains current state; When the measured value of temperature measuring apparatus 5 is greater than target temperature value, control module regulates the control valve in the first rapid chilling section 1, to open the cooling water flow of more control valve and/or increase collector in the first rapid chilling section 1, thereby increase the cooling velocity of the first rapid chilling section 1; When the measured value of temperature measuring apparatus 5 is less than target temperature value, control module regulates the control valve in the first rapid chilling section 1, to open control valve still less and/or reduce the cooling water flow of collector in the first rapid chilling section 1, thereby reduce the cooling velocity of the first rapid chilling section 3.By can effectively guaranteeing that to the adjustment of cooling velocity the slab of producing is in good intensity of cooling, thereby optimize institutional framework and the performance of slab.Due to less at the temperature changing speed of air cooling section 2 cut deals, and in air cooling section 2, there is no cooling group 4, to slab, do not spray cooling water, therefore, temperature measuring apparatus 5 is arranged in air cooling section 2, be conducive to like this installation and the mensuration to slab temperature of temperature measuring apparatus 5, and be conducive to the cooling effect of the first rapid chilling section 1 to detect, and the cooling velocity of the first rapid chilling section 1 and the second rapid chilling section 3 is correspondingly adjusted.
In addition, target temperature value is thickness by slab, the position of temperature, roller table speed and measuring point for the temperature etc. is determined during cooling end for the first time, temperature measuring apparatus 5 is preferably placed at air cooling section 2 along in 1/3 to 2/3 region of its length, and target temperature value is preferably 700 ℃ ~ 720 ℃.
And, under preferable case, this laminar cooling system also can comprise for measuring the velocity sensor of the roller table speed of hot continuous rolling production line, this velocity sensor is electrically connected to control module, so that the roller table speed recording is transferred to control module, control module obtains cooling water flow in this cooling procedure, collector is opened the numerical value of factor and the temperature variations of slab relevant with slab variations in temperature such as quantity and roller table speed, usings the reference regulating as the cooling procedure to next.
The present invention also provides a kind of hot continuous rolling production line, many finishing mills of this hot continuous rolling production line 6, coiling machine 7 and above-mentioned laminar cooling system, laminar cooling system is arranged on along between last finishing mill 6 and coiling machine 7 of the rolling direction of this hot continuous rolling production line, a part that has shown hot continuous rolling production line in Fig. 1, wherein, at the front portion (B point) of the laminar cooling system of this hot continuous rolling production line and rear portion (C point), be also respectively arranged with the temperature measuring equipment that finishing temperature and coiling temperature are measured.
According to the laminar flow cooling means of slab of the present invention, laminar cooling system and hot continuous rolling production line rolling slab, can adjust more exactly cooling velocity, guarantee the coiling temperature of slab, and more cooling slab, reduce distortion and residual stress that slab produces in cooling procedure as far as possible, guarantee the performance of slab.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.It should be noted that in addition each the concrete technical characterictic described in the above-mentioned specific embodiment, in reconcilable situation, can combine by any suitable mode.In addition, between various embodiment of the present invention, also can be combined, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
The present invention is further illustrated for following embodiment, but therefore do not limit the present invention.
In following embodiment and comparative example:
The assay method of yield strength: GB/T 228-2002 metal material tensile test at room temperature method.
The assay method of tensile strength: GB/T 228-2002 metal material tensile test at room temperature method.
The assay method of percentage elongation: GB/T 228-2002 metal material tensile test at room temperature method.
Embodiment 1-3
Use laminar cooling system in accompanying drawing 1 to carry out laminar flow to 20mmQ345B slab cooling, theoretical coiling temperature is 590 ℃, high temperature billet steel head until high temperature goes out after last finishing mill of this hot continuous rolling production line, stable rolling rhythm, guarantee that steel billet is stable in the finishing temperature of mm finishing mill unit, this slab passes through laminar cooling system with the speed of 3.2m/s along milling method, laminar cooling system comprises cooling for the first time successively to this slab cooling, cooling and cooling for the third time for the second time, cooling and be cooled to for the third time water-cooled for the first time, be cooled to for the second time air cooling, regulate respectively cooling and cooling cooling velocity for the third time for the first time, while making cooling beginning for the second time, the surface temperature of (A1 point in Fig. 1) slab is T1, during cooling end for the second time, the surface temperature of (A2 point in Fig. 1) slab is T3, when the cooling A of proceeding to some position for the second time, (A point in Fig. 1) measured the surface temperature of slab, target temperature value is T2, by comparison object temperature value T2, regulate with the cooling velocity before the actual measured value recording in A point place is to A1 point and after A2 point, last actual coiling temperature is 583 ℃, by the slab air cooling making to room temperature, mensuration makes yield strength, tensile strength and the percentage elongation of slab, and result is as shown in table 2.T1, the T2 in embodiment 1-3, value and the position of A point between A1 point and A2 point of T3 in table 1, have been shown.
Table 1
| T1/℃ | T2/℃ | T3/℃ | A point position | |
| Embodiment 1 | 712 | 700 | 663 | 1/3 place that A1 point-A2 is ordered |
| Embodiment 2 | 720 | 710 | 680 | 1/2 place that A1 point-A2 is ordered |
| Embodiment 3 | 728 | 720 | 695 | 2/3 place that A1 point-A2 is ordered |
Table 2
| Yield strength/MPa | Tensile strength/MPa | Percentage elongation/% | |
| Embodiment 1 | 382 | 590 | 28 |
| Embodiment 2 | 376 | 556 | 29 |
| Embodiment 3 | 361 | 538 | 31 |
Comparative example
Use laminar cooling system to carry out laminar flow to 20mmQ345B slab cooling, theoretical coiling temperature is 590 ℃, high temperature billet steel head until high temperature goes out after last finishing mill of this hot continuous rolling production line, stable rolling rhythm, guarantee that steel billet is stable in the finishing temperature of mm finishing mill unit, this slab passes through laminar cooling system with the speed of 3.2m/s along milling method, laminar cooling system comprises successively for the first time this slab cooling and is cooling for the second time, cooling and the cooling water-cooled that is for the second time for the first time, regulate respectively cooling and cooling cooling velocity for the second time for the first time, cooling cooling velocity is greater than cooling for the second time cooling velocity for the first time, actual coiling temperature is 583 ℃, by the slab air cooling making to room temperature, measure to such an extent that yield strength is 365MPa, tensile strength is that 592MPa and percentage elongation are 16.5%.
Testing result by comparative example and comparative example is known, use yield strength and the percentage elongation of the slab of laminar cooling system of the present invention and the production of laminar flow cooling means to be improved, and the accuracy that coiling temperature is controlled also improves.
Claims (13)
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| CN110523787A (en) * | 2019-09-30 | 2019-12-03 | 攀钢集团攀枝花钢铁研究院有限公司 | A method for ultra-rapid cooling of hot continuous rolling steel intermediate billet |
| CN113444860A (en) * | 2021-06-28 | 2021-09-28 | 二重（德阳）重型装备有限公司 | Quenching method for workpieces with large thickness difference |
| CN113444860B (en) * | 2021-06-28 | 2022-07-01 | 二重（德阳）重型装备有限公司 | Quenching method for workpieces with large thickness difference |
| CN113680833A (en) * | 2021-08-06 | 2021-11-23 | 唐山钢铁集团有限责任公司 | Layer cooling control method for realizing two-stage cooling by utilizing conventional cooling |
| CN114292999A (en) * | 2021-12-10 | 2022-04-08 | 鞍钢集团工程技术有限公司 | An extra-thick plate quenching device with automatic control of water cooling and air cooling |
| CN114292999B (en) * | 2021-12-10 | 2023-06-16 | 鞍钢集团工程技术有限公司 | Super-thick plate quenching device capable of automatically controlling water cooling and air cooling |
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